CN106961303A - A kind of light source method for arranging of indoor visible light communication system - Google Patents
A kind of light source method for arranging of indoor visible light communication system Download PDFInfo
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- CN106961303A CN106961303A CN201710113923.1A CN201710113923A CN106961303A CN 106961303 A CN106961303 A CN 106961303A CN 201710113923 A CN201710113923 A CN 201710113923A CN 106961303 A CN106961303 A CN 106961303A
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- 238000004891 communication Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005286 illumination Methods 0.000 claims abstract description 51
- 239000013308 plastic optical fiber Substances 0.000 claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 241000894007 species Species 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000003491 array Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 241000700647 Variola virus Species 0.000 claims description 3
- 201000009310 astigmatism Diseases 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 7
- 238000005457 optimization Methods 0.000 abstract description 6
- 238000004364 calculation method Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
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- 210000003739 neck Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
- F21V2200/10—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type
- F21V2200/17—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type characterised by the admission of light into the guide
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Abstract
The present invention relates to indoor visible light communication, indoor visible light illumination, indoor polymer optical fiber communication and indoor plastic optical fiber lighting field, the light source method for arranging of more particularly to a kind of indoor visible light communication system.This method sets up threedimensional model according to indoor spatial parameter, calculated by making receiving plane signal to noise ratio least squares optimization come the light source power to whole ceiling plane each position, to ensure indoor reliable and uniform communication quality, and ensure to meet minimum illuminance standard in illumination plane.Light source is divided into by two classes according to result of calculation, the commercial LED light source for disposing corresponding transmitting luminous power in first kind light source position is used as key light, and a part of optical coupling for LED light source being sent by optics is entered plastic optical fiber and guided to Equations of The Second Kind light source position as auxiliary radiant, realize indoor visible light communication and illumination that LED and plastic optical fiber be combined.This method is realized simply, and the reliability and uniformity of communication quality are ensure that at lower cost, energy-conservation purpose is effectively reached.
Description
Technical field
The present invention relates to indoor visible light communication, indoor visible light illumination, indoor polymer optical fiber communication and indoor modeling
Expect optical fibre illumination field, the light source method for arranging of more particularly to a kind of indoor visible light communication system.
Background technology
The LED technology of energy-conservation turns into the first choice of current room lighting facility, and LED-based visible light communication is used as one
The function being attached on room lighting facility is planted, because of its energy-conserving and environment-protective, radio spectrum resources in short supply, information privacy is not take up
Good the advantages of, the focus that the communications field is studied is turned into recent years.On the other hand, plastic optical fiber is cheap, light, core diameter is larger,
Pliability is good, also many a little with electromagnetism interference, high bandwidth etc., has also been applied to illumination and short distance information transfer neck
Domain, with the further decline of cost, its following application prospect will be very huge.But go out from the angle for taking into account the two respective advantage
Hair, the indoor visible light communication system that there is no LED and plastic optical fiber to be combined at present occurs.
Indoor visible light communication system, which has, to communicate and two functions of illumination.For communication, due to visible light communication
Receiver is mobile terminal, in order to ensure that it can obtain transmitting performance, it is necessary to ensure in receiving plane optional position indoors
The signal to noise ratio of each position is attained by certain index.Meanwhile, indoor visible light communication system can have multiple mobile terminals
Situation, therefore from communication fairness angle, also require that each position signal to noise ratio of receiving plane is close to each other.So, receive
The uniformity of each position signal to noise ratio of plane is particularly important in visible light communication system indoors.On the other hand, in lighting criteria
Regulation for room lighting planar light illumination is a scope, for example, the illuminance of office work place illumination is typically required
For 300~1500lx, as long as meeting the scope, you can think that illuminance is up to standard.Therefore can be to the illuminance of room lighting plane
Again considered and designed, it is met lighting criteria by minimum requirements as far as possible, to reach the purpose of energy-saving and emission-reduction.
Although " CN 201410401349 " discloses a kind of indoor LED lamp battle array for taking into account illumination and communication reliability to patent
The method for arranging of row, but have the following disadvantages：
(1), the scheme that the patent is proposed is without departing from the four rotationally symmetrical LED light arrays set in ceiling plane
Yoke, each sub-light source power is identical, and calculating simply is optimized to the position of LED light array, therefore limitation is big, it is impossible to
Receiving plane really obtains uniform signal to noise ratio.In addition, the patent does not account for the uniformity of receiving plane communication quality completely,
This mobility that can make visible light communication mobile terminal and the communication fairness of multiple terminals are limited.
(2), the patent carries out combined optimization to illuminance and the bit error rate, but purpose is to " meet the equal of indoor illumination intensity
Even property demand ", this is conflicting.Because if in order to which the uniformity demands for obtaining illuminance should just be carried out to illuminance
Single optimization, otherwise can not obtain real uniform illuminance.In addition, compared to the uniformity of illuminance, whether illuminance is full
Sufficient lighting criteria seems even more important, can see from the accompanying drawing of the patent, after being calculated using combined optimization method, subregion
Illuminance be unable to reach the minimum of lighting criteria（Minimum illuminance should be greater than 300lx for office）, and not
Uniformly, this can cause that indoor regional area is dark, and illuminating effect is poor.
(3) it is " for communication system, errored bit to be desirable to certainly that, the patent, which carries out another starting point of combined optimization,
Rate can be the smaller the better ".But it is noted that the cost that the smaller the better bit error rate of pursuit is paid is the noise constantly increased
Than this also means that the transmission signal power constantly increased, this is disagreed with the original intention of energy-saving and emission-reduction.In fact, indoors
The signal to noise ratio of visible light communication system need not simultaneously be the bigger the better, as long as more than one threshold value, coordinates making for forward error correction
With, it is possible to error free transmission is realized, reliable communication is realized, while also reaching the purpose of energy-conserving and environment-protective.
(4), the patent is illuminated using four LED light arrays, each array comprising hundreds and thousands of sub-light sources and
With other suitable electronic elements, greatly, installation, maintenance, replacement cost are high, and difficulty is big for probability of malfunction.
The content of the invention
The present invention seeks in view of the drawbacks described above of prior art there is provided a kind of new indoor visible light communication system
Light source method for arranging, realize indoor visible light communication and illumination that LED and plastic optical fiber be combined first, protects at lower cost
The reliability and uniformity of communication quality are demonstrate,proved, and ensures to meet illuminance as defined in lighting criteria, while effectively reaching energy-conservation
Purpose.
To achieve these goals, a kind of light source method for arranging of indoor visible light communication system of the invention uses following skill
Art scheme is realized：
The light source method for arranging of a kind of indoor visible light communication system, for determining treating for whole ceiling plane each position light source
The transmitting luminous power parameter and light source species of calculating, comprise the following steps：
（1）, threedimensional model is set up according to the interior space parameter of the indoor visible light communication system, and by the three dimensions
It is evenly dividing in whole ceiling plane in model as some grids, the center of each grid（x1,y1）All set
Light source is set to, each source emissioning light power P t (x1, y1) is to be solved；
（2）, receiving plane set according to visible light communication receiver activity height, required for specifying in the receiving plane
Average signal-to-noise ratio C, step is set to by C（3）Initial average signal-to-noise ratio；
（3）, the receiving plane is evenly dividing as some grids, it is in the receiving plane to set up object function F, the F
Each grid element center position（x2,y2）Signal to noise ratio snr（x2,y2）Variance, try to achieve the smallpox by minimizing the F
The source emissioning light power P t (x1, y1) of plate plane each position；
（4）, illumination plane is set according to illuminator level, and specify target illuminance El, judge step（3）Middle calculated institute
Can the light source arrangement of ceiling plane be stated make the center of all grids of the illumination plane（x3,y3）The illuminance at place
E（x3,y3）All reach the El；
（5）, as the illuminance E for the center position that there is Partial Mesh in the illumination plane（x3,y3）It is not reaching to described
El when, increase the average signal-to-noise ratio C, return to step（3）Restart the Pt (x1, y1) calculating；
（6）, as the illuminance E of the center position of all grids in the illumination plane（x3,y3）When all reaching described El,
According to step（4）Each source emissioning light power P t (x1, y1) calculated, all light sources of the ceiling plane are divided
For first kind light source and the class of Equations of The Second Kind light source two；
（7）, the first kind light source place ceiling plane position（x1,y1）, accordingly transmitting luminous power is equal to for placement
Or the commercial LED light source slightly larger than Pt (x1, y1) carries out indoor communications and illumination as key light；
（8）, by optics, by step（7）Described in a part of optical coupling for sending of commercial LED light source enter the plastic light
The position of ceiling plane that is fine and being separately directed to where the Equations of The Second Kind light source, using end face it is luminous in the way of be used as auxiliary light light
Source carries out indoor communications and illumination.
In a preferred embodiment of the present invention, the indoor visible light communication system include visible light communication emitter and
Visible light communication receiver.Light source species in the ceiling plane has commercial LED light source and the luminous plastic optical fiber of end face
Two kinds, the visible light communication emitter is collectively constituted, identical optical signal is sent and is communicated and two work(of illumination with realizing simultaneously
Energy.The visible light communication receiver can be moved as mobile terminal in the receiving plane of specified altitude assignment.
In a preferred embodiment of the present invention, described grid, is shaped as rectangle, and size is identical, and close-packed arrays are seamless
Gap.
In a preferred embodiment of the present invention, the average signal-to-noise ratio C can make the indoor visible light communication system exist
Receiving plane reaches reliable communication quality.
In a preferred embodiment of the present invention, described object function F is：
Wherein, N2 is the grid sum in the receiving plane.
In a preferred embodiment of the present invention, the signal to noise ratio snr (x2, y2) of each position in the object function F is
On the function of each source emissioning light power P t (x1, y1), its relation is：
Wherein, γ is photoelectric detector photoelectric conversion factors, and M (x1, y1) is ceiling plane position (x1, y1) place light source
Modulation index, H (x1, y1, x2, y2) be the ceiling plane position (x1, y1) arrive the receiving plane position (x2, y2)
Visible light channel DC current gain, q is electron charge, and B is equivalent noise bandwidth, and Ibg is background current, and I2 is noise bandwidth system
Number, Nt is thermal noise power.
In a preferred embodiment of the present invention, the described target illuminance El specified is the smaller the better, but needs to meet
Indoor lighting standard, i.e., described El is the lower limit for meeting the illuminance scope under indoor lighting standard.In addition, however not excluded that described to shine
Bright plane and the receiving plane are conplane situation.
In a preferred embodiment of the present invention, the first kind source emissioning light power is larger, the Equations of The Second Kind light source
Transmitting luminous power is smaller, and the transmitting luminous power of the first kind light source is much larger than the transmitting luminous power of the Equations of The Second Kind light source.
In a preferred embodiment of the present invention, the commercial LED light source lighting angle is big, and astigmatism is good, it is preferred to use
Lambertian source.
In a preferred embodiment of the present invention, each first kind light source position is being selected（x1,y1）Placement
During commercial LED light source, transmitting luminous power should be selected to be more than or equal to Pt (x1, y1) and closest to Pt (x1, y1) commercial LED light
Source.
In a preferred embodiment of the present invention, the optics does not block commercial LED light source and the receiving plane
Between direct projection link, its function is that the light that sends of commercial LED light source side is converged into plastic optical fiber incidence end, it is preferable that
The optics can be convex lens.
In a preferred embodiment of the present invention, an optics piece plastic optical fiber of correspondence, a commercialization LED can be right
Multiple optics are answered, i.e., each commercialization LED a part of light can be used for many plastic optical fibers simultaneously as light source.
In a preferred embodiment of the present invention, the length and attenuation coefficient of the plastic optical fiber are available for regulation to combine, with
The transmitting luminous power of optical fiber connector is controlled, is allowed to close to step（4）The transmitting luminous power of obtained each Equations of The Second Kind light source.
In a preferred embodiment of the present invention, the light-emitting mode of the plastic optical fiber end and commercialization LED light-emitting modes
It is similar, it is preferable that to dispose a concavees lens as taillight closer to the commercial LED's in each plastic optical fiber end
Light-emitting mode.
The beneficial effects of the invention are as follows：
(1) yoke using four rotationally symmetrical LED light array layouts in traditional scheme, is breached, it is flat in whole ceiling
The category in face considers the design of light source arrangement, using source emissioning light power and light source species all as parameter to be optimized, than
In traditional scheme this equivalent to adding design dimension.Meanwhile, uniform signal to noise ratio can be obtained in receiving plane, thus it is effectively full
The foot mobility and the communication fairness of multiple terminals of visible light communication mobile terminal.
(2), with reference to the use of forward error correction, while receiving plane each position all obtains transmitting performance, nothing
The bit error rate of " the smaller the better " need to be pursued as traditional scheme, it reduce the signal-noise ratio threshold required for system, is reduced
Total required transmitting luminous power, has reached the purpose of energy-conservation.
(3), while receiving plane communication quality uniformity is met, it is ensured that illumination plane illuminance can reach photograph
Bright standard.Carrying out design principle up to standard by the minimum of lighting criteria also can effectively reduce required light source transmission power,
Reach the purpose of energy-conservation.
(4) advantage of both LED light source and plastic optical fiber, environmental protection, have been had concurrently.The second of the ceiling plane
Class position is communicated and illuminated as auxiliary radiant instead of Conventional LED light sources using plastic optical fiber, greatly reduces light source
Cost is laid out, and is easy to follow-up maintenance and the replacing of light source.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, it can also obtain other according to these accompanying drawings
Accompanying drawing, wherein：
Fig. 1 is a kind of embodiment flow of the light source method for arranging of indoor visible light communication system proposed by the present invention
Figure.
Fig. 2 is the source layout using a kind of ceiling plane obtained by the present invention.
The part optical coupling of one commercial LED light source is entered plastic optical fiber as auxiliary light and the LED light source by Fig. 3 for the present invention
The schematic diagram that the key light sent is communicated and illuminated jointly.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
It refer to accompanying drawing 1, the embodiment of the present invention：
The light source method for arranging of a kind of indoor visible light communication system, for determining treating for whole ceiling plane each position light source
The transmitting luminous power parameter and light source species of calculating, step are as follows：
（1）, threedimensional model is set up according to the interior space parameter of the indoor visible light communication system, and by the three dimensions
It is evenly dividing in whole ceiling plane in model as some grids, the center of each grid（x1,y1）All set
Light source is set to, each source emissioning light power P t (x1, y1) is to be solved；
（2）, receiving plane set according to visible light communication receiver activity height, required for specifying in the receiving plane
Average signal-to-noise ratio C, step is set to by C（3）Initial average signal-to-noise ratio；
（3）, the receiving plane is evenly dividing as some grids, it is in the receiving plane to set up object function F, the F
Each grid element center position（x2,y2）Signal to noise ratio snr（x2,y2）Variance, try to achieve the smallpox by minimizing the F
The source emissioning light power P t (x1, y1) of plate plane each position；
（4）, illumination plane is set according to illuminator level, and specify target illuminance El, judge step（3）Middle calculated institute
Can the light source arrangement of ceiling plane be stated make the center of all grids of the illumination plane（x3,y3）The illuminance at place
E（x3,y3）All reach the El；
（5）, when the center that there is Partial Mesh in the illumination plane is not reaching to described El, increase described average
Signal to noise ratio C, return to step（3）Restart the Pt (x1, y1) calculating；
（6）, when the center of all grids in the illumination plane all reaches described El, according to step（4）Calculated
All light sources of the ceiling plane are divided into first kind light source and by each source emissioning light power P t (x1, y1) gone out
The class of two class light source two；
（7）, the first kind light source place ceiling plane position（x1,y1）, accordingly transmitting luminous power is equal to for placement
Or the commercial LED light source slightly larger than Pt (x1, y1) carries out indoor communications and illumination as key light；
（8）, by optics, by step（7）Described in a part of optical coupling for sending of commercial LED light source enter the plastic light
The position of ceiling plane that is fine and being separately directed to where the Equations of The Second Kind light source, using end face it is luminous in the way of be used as auxiliary light light
Source carries out indoor communications and illumination.
The thinking of the present invention is to assume initially that each grid element center of whole ceiling plane all has light source, but each light source is sent out
Penetrate luminous power unknown to be solved, each light source species is also unknown.Enter next, obtaining uniform signal to noise ratio using in receiving plane as target
Row optimization, one group of light source power parameter is obtained to calculate, while meeting minimum illuminance requirement.If whole ceiling plane is each
Grid element center all installs commercial LED light source according to the source emissioning light power obtained by result of calculation, then there are problems that two：
A. the more easy increase cost of required LED light source number；B. in some grid element center positions, obtained light source transmitting is calculated
Luminous power very little, the transmitting luminous power of even less than single led chip, then installing LED light source in the position becomes infeasible, but
If not installing light source in these positions, the uniformity of receiving plane signal to noise ratio can be influenceed again, increase the fluctuation of signal to noise ratio,
Regional area causes the reduction of bit error rate performance.
Therefore, the present invention innovatively proposes the less position of light source transmission power obtained by calculating, using plastic light
Fibre illumination is communicated and illuminated as auxiliary radiant.By the power of auxiliary light is much smaller than the key light that commercial LED light source is sent
Power, therefore be feasible using the light source of a part of light as the plastic optical fiber of key light.Thus eliminate in low-power light source
The cost required for LED light source is installed in position, while can guarantee that the uniformity of receiving plane signal to noise ratio and the light of illumination plane again
Illumination is up to standard.Therefore commercial LED light source and the luminous two kinds of light sources of plastic optical fiber of end face will collectively constitute the visible light communication hair
Machine is penetrated, identical optical signal is sent and is communicated and two functions of illumination with realizing simultaneously.
In the present embodiment, it is a 5m*5m*3m from scene（The long wide * of * are high）Indoor room, therefore the ceiling
Plane is 5m*5m.Ceiling plane is divided into 8*8 grid, each mesh shape is square, and size is identical, closely
Arrangement is seamless.There are 64 grids, each grid element center position reaches that the power of sub-light source is unknown to be solved, light source species
Also it is unknown.
It is highly 0.85m to set receiving plane, and its mesh generation and ceiling plane are consistent.With NRZ-OOK signals
Exemplified by, the relation of its signal to noise ratio and error rate BER is：
Wherein, erfc is Gauss error function.In a communications system, can be 10 in the case of using forward error correction-3
Effective error correction is carried out under the error rate condition of the order of magnitude and realizes the transmitting of zero defect.Therefore this example selection average signal-to-noise ratio
16 dB are used as initial value, i.e. C=10*log16（Log functions are bottom with 10）, can which ensure that can be obtained in receiving plane
The transmission performance leaned on.
Described object function F is：
Wherein, N2 is the grid sum in the receiving plane, is taken as 64.The signal to noise ratio of each position in the object function F
SNR (x2, y2) is the function on each source emissioning light power P t (x1, y1), and its relation is：
Wherein, γ is photoelectric detector photoelectric conversion factors, and M (x1, y1) is ceiling plane position (x1, y1) place light source
Modulation index, H (x1, y1, x2, y2) be the ceiling plane position (x1, y1) arrive the receiving plane position (x2, y2)
Visible light channel DC current gain, q is electron charge, and B is equivalent noise bandwidth, and Ibg is background current, and I2 is noise bandwidth system
Number, Nt is thermal noise power.The Pt (x1, y1) for making object function F reach minimum is solved under constraints, wherein, for
Object function F constraints is：All Pt (x1, y1) are more than or equal to 0.
Next, specifying illumination plane and target illuminance, the mesh generation and ceiling plane of illumination plane are kept
Unanimously.In this example, it is assumed that illumination plane and the receiving plane are same plane.According to the principle of energy-conservation, specify
Target illuminance El should be the smaller the better, but needs to meet indoor lighting standard, i.e., described El is met under indoor lighting standard
Illuminance scope lower limit.According to International Organization for standardization（ISO）Defined " illumination in office work place " standard（ISO
8995:2002/CIE S008/E: 2001）And " the office work that the standardized management committee of the People's Republic of China (PRC) promulgates
The illumination in place " standard（GB T 26189-2010）, exemplified by the scene filed by office file, duplicated, choose 300lx and make
For described target illuminance El.
The Pt (x1, y1) calculated according to previous step, judges in the center of all grids of the illumination plane
（x3,y3）Whether place all reaches described specified minimum illuminance El.The illuminance E of each grid element center of illumination plane（x3,
y3）Computational methods it is as follows：
Wherein, H (x1, y1, x3, y3) is that the ceiling plane position (x1, y1) arrives the illumination plane position (x3, y3)
Visible light channel DC current gain, A is photoelectric detector area, and α is the conversion coefficient between luminous flux and luminous power.Shone when described
When the center that there is Partial Mesh in bright plane is not reaching to described El, increases the average signal-to-noise ratio C, made with 1dB
Circulate the interval increased every time by C, new C is substituted into the calculating that object function F restarts the Pt (x1, y1), until
The illuminance of the center of all grids all reaches described El in the illumination plane.
According to each source emissioning light power P t (x1, y1) calculated, all light sources of the ceiling plane are divided
For first kind light source and the class of Equations of The Second Kind light source two, the first kind source emissioning light power is larger, the Equations of The Second Kind light source transmitting
Luminous power is smaller.In the present embodiment, in view of the transmitting luminous power of the chip of single led light source is tens of mW orders of magnitude, therefore will
100mW is used as the line of demarcation for dividing the first kind and Equations of The Second Kind light source.If Pt (x1, y1) is more than 100mW, then will be in ceiling plane
The light source at position (x1, y1) place is classified as the first kind, and the light source of rest position is classified as into Equations of The Second Kind light source.In the first kind
The position of the place ceiling plane of light source（x1,y1）, placement is corresponding to launch the business that luminous power is equal or slightly larger than Pt (x1, y1)
Indoor communications and illumination are carried out as key light with LED light source, the commercial LED light source there should be lighting angle greatly, and astigmatism is good
Advantage, it is preferred to use Lambertian source.By optics, a part of optical coupling that commercial LED light source is sent is entered into plastic light
The position of ceiling plane that is fine and being separately directed to where the Equations of The Second Kind light source, using end face it is luminous in the way of be used as auxiliary light light
Source carries out indoor communications and illumination.
Accompanying drawing 2 describes a kind of source layout of the ceiling plane using obtained by the present invention, flat in the ceiling
Each grid element center position in face disposes the taillight of the commercial LED light source or the plastic optical fiber.It note that each business of selection
With the transmitting luminous power of LED light source, correspondence position is marked in figure.After the source layout, obtained in receiving plane
SNR ranges are 34.7dB to 35.2dB, and signal to noise ratio fluctuation range is only 0.5dB, meets the uniformity and reliability of communication performance
Property.And minimum illuminance is 315lx, just reaches the marginal illumination standard 300lx of indoor office, and effectively realize energy-saving ring
The purpose of guarantor.It is further seen that the source layout in Fig. 2 employs 32 commercialization LED altogether, compared to traditional scheme significantly
Quantity of light source is reduced, this layout cost and follow-up maintenance for potentially reducing light source, the difficulty changed.
Accompanying drawing 3 is described in the visible light communication system enters plastic optical fiber by the part optical coupling of one of LED light source
The schematic diagram for being communicated and being illuminated jointly with the key light that the commercial LED light source goes out as auxiliary light.To realize that plastic optical fiber is illuminated,
The optical coupling of the commercial LED light source is entered into each plastic optical fiber using a convex lens, each convex lens are not blocked respectively
Direct projection link between the commercial LED light source and the receiving plane.Each plastic optical fiber is selected according to nearby principle
Commercial LED draws luminous energy as its light source.A concavees lens are disposed in the end of the every plastic optical fiber to be made as taillight
Its light-emitting mode close to the commercial LED.
In summary, the light source method for arranging for a kind of indoor visible light communication system that the present invention is pointed out, can be by commercialization
Both auxiliary light that the key light and plastic optical fiber that LED light source is sent are drawn from LED light source is combined to be led to carry out indoor visible light
Letter and illumination, ensure that the reliability and uniformity of communication quality, and effectively reach the purpose of energy-conservation at lower cost.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, is included within the scope of the present invention.
Claims (14)
1. the light source method for arranging of a kind of indoor visible light communication system, for determining whole ceiling plane each position light source
Transmitting luminous power parameter and light source species to be calculated, step is as follows：
（1）, threedimensional model is set up according to the interior space parameter of the indoor visible light communication system, and by the three dimensions
It is evenly dividing in whole ceiling plane in model as some grids, the center of each grid（x1,y1）All set
Light source is set to, each source emissioning light power P t (x1, y1) is to be solved；
（2）, receiving plane set according to visible light communication receiver activity height, required for specifying in the receiving plane
Average signal-to-noise ratio C, step is set to by C（3）Initial average signal-to-noise ratio；
（3）, the receiving plane is evenly dividing as some grids, it is in the receiving plane to set up object function F, the F
Each grid element center position（x2,y2）Signal to noise ratio snr（x2,y2）Variance, try to achieve the smallpox by minimizing the F
The source emissioning light power P t (x1, y1) of plate plane each position；
（4）, illumination plane is set according to illuminator level, and specify target illuminance El, judge step（3）Middle calculated institute
Can the light source arrangement of ceiling plane be stated make the center of all grids of the illumination plane（x3,y3）The illuminance at place
E（x3,y3）All reach the El；
（5）, as the illuminance E for the center position that there is Partial Mesh in the illumination plane（x3,y3）It is not reaching to described
El when, increase the average signal-to-noise ratio C, return to step（3）Restart the Pt (x1, y1) calculating；
（6）, as the illuminance E of the center position of all grids in the illumination plane（x3,y3）When all reaching described El,
According to step（4）Each source emissioning light power P t (x1, y1) calculated, all light sources of the ceiling plane are divided
For first kind light source and the class of Equations of The Second Kind light source two；
（7）, the first kind light source place ceiling plane position（x1,y1）, accordingly transmitting luminous power is equal to for placement
Or the commercial LED light source slightly larger than Pt (x1, y1) carries out indoor communications and illumination as key light；
（8）, by optics, by step（7）Described in a part of optical coupling for sending of commercial LED light source enter the plastic light
The position of ceiling plane that is fine and being separately directed to where the Equations of The Second Kind light source, using end face it is luminous in the way of be used as auxiliary light light
Source carries out indoor communications and illumination.
2. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that the interior
Visible light communication system includes visible light communication emitter and visible light communication receiver；Light source kind in the ceiling plane
Class has commercial LED light source and two kinds luminous of plastic optical fiber of end face, collectively constitutes the visible light communication emitter, sends identical
Optical signal with simultaneously realize communicate and illumination two functions；The visible light communication receiver can refer to as mobile terminal
Determine to move in the receiving plane of height.
3. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that described net
Lattice, are shaped as rectangle, and size is identical, and close-packed arrays are seamless.
4. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that in the step
Suddenly（2）In, the average signal-to-noise ratio C can make the indoor visible light communication system reach reliable communication quality in receiving plane.
5. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that in the step
Suddenly（3）In, object function F is：
Wherein, N2 is the grid sum in the receiving plane.
6. object function according to claim 5, it is characterised in that the signal to noise ratio of each position in the object function F
SNR (x2, y2) is the function on each source emissioning light power P t (x1, y1), and its relation is：
Wherein, γ is photoelectric detector photoelectric conversion factors, and M (x1, y1) is ceiling plane position (x1, y1) place light source
Modulation index, H (x1, y1, x2, y2) be the ceiling plane position (x1, y1) arrive the receiving plane position (x2, y2)
Visible light channel DC current gain, q is electron charge, and B is equivalent noise bandwidth, and Ibg is background current, and I2 is noise bandwidth system
Number, Nt is thermal noise power.
7. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that in the step
Suddenly（4）In, the described target illuminance El specified is the smaller the better, but needs to meet indoor lighting standard, i.e., described El is full
The lower limit of illuminance scope under sufficient indoor lighting standard；In addition, however not excluded that the illumination plane and the receiving plane are same
The situation of one plane.
8. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that in the step
Suddenly（6）In, the first kind source emissioning light power is larger, and the Equations of The Second Kind source emissioning light power is smaller, the first kind
The transmitting luminous power of light source is much larger than the transmitting luminous power of the Equations of The Second Kind light source.
9. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that in the step
Suddenly（7）In, the commercial LED light source lighting angle is big, and astigmatism is good, it is preferred to use Lambertian source.
10. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that described
Step（7）In, selecting each first kind light source position（x1,y1）During the commercial LED light source of placement, transmitting should be selected
Luminous power is more than or equal to Pt (x1, y1) and closest to Pt (x1, y1) commercial LED light source.
11. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that described
Step（8）In, the optics does not block the direct projection link between commercial LED light source and the receiving plane, and its function is
The light that commercial LED light source side is sent converges to plastic optical fiber incidence end, it is preferable that the optics can be convex lens
Mirror.
12. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that described
Step（8）In, an optics piece plastic optical fiber of correspondence, a commercialization LED can correspond to multiple optics, i.e., each business
It can be used simultaneously for many plastic optical fibers as light source with LED a part of light.
13. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that described
Step（8）In, the length and attenuation coefficient of the plastic optical fiber are available for regulation to combine, to control the transmitting light work(of optical fiber connector
Rate, is allowed to close to step（4）The transmitting luminous power of obtained each Equations of The Second Kind light source.
14. the light source method for arranging of indoor visible light communication system according to claim 1, it is characterised in that described
Step（8）In, the light-emitting mode of the plastic optical fiber end is similar with commercialization LED light-emitting modes, at each plastic optical fiber end
End one concave lens of placement are used as light-emitting mode of the taillight closer to the commercial LED.
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Denomination of invention: A light source layout method for indoor visible light communication system Effective date of registration: 20210625 Granted publication date: 20190319 Pledgee: Rudong sub branch of Bank of China Limited Pledgor: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. Registration number: Y2021320000096 |
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Effective date of registration: 20211216 Address after: 226463 Zhongtian Industrial Park, Hekou Town, Rudong, Nantong, Jiangsu Patentee after: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. Patentee after: Zhongtian Communication Technology Co., Ltd Address before: 226463 Zhongtian Industrial Park, Hekou Town, Rudong, Nantong, Jiangsu Patentee before: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. |